EP0939481A1 - Dispositif de refroidissement à air pour moteurs électriques comportant un collecteur - Google Patents

Dispositif de refroidissement à air pour moteurs électriques comportant un collecteur Download PDF

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Publication number
EP0939481A1
EP0939481A1 EP98830081A EP98830081A EP0939481A1 EP 0939481 A1 EP0939481 A1 EP 0939481A1 EP 98830081 A EP98830081 A EP 98830081A EP 98830081 A EP98830081 A EP 98830081A EP 0939481 A1 EP0939481 A1 EP 0939481A1
Authority
EP
European Patent Office
Prior art keywords
commutator
slots
motor
air
deviating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98830081A
Other languages
German (de)
English (en)
Other versions
EP0939481B1 (fr
Inventor
Edoardo Dell'oro
Ezio Cattaneo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cardi Srl
Original Assignee
Cardi Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cardi Srl filed Critical Cardi Srl
Priority to DE1998600036 priority Critical patent/DE69800036T2/de
Priority to EP19980830081 priority patent/EP0939481B1/fr
Publication of EP0939481A1 publication Critical patent/EP0939481A1/fr
Application granted granted Critical
Publication of EP0939481B1 publication Critical patent/EP0939481B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/28—Cooling of commutators, slip-rings or brushes e.g. by ventilating
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Definitions

  • the present invention relates to an air cooling device for electric motors provided wiht a collector, said device being of the type comprising at least one fan integral with the shaft of a motor to effect an air flow and slots for the intake and exhaust of the air flow, slots associated with an outer casing of the motor and able to orient said flow along the motor itself.
  • the nominal or rated power indicates the power that the motor can absorb under the prescribed operating conditions without being subjected to overheating, which may compromise its proper operation.
  • each motor is generally fitted with an open-loop air cooling device comprising a fan driven directly by the shaft of the motor itself to obtain a forced circulation of air, i.e. a flow of air between intake slots and exhaust slots obtained in appropriate positions in the outer casing of the motor.
  • the technical task whereon the present invention is based is to conceive an air cooling device for electric motors provided with a commutator, able to overcome the aforementioned limitations, i.e. able to improve the cooling effectiveness and consequently to allow the absorption and output of greater powers for the same weight and size of the motor.
  • an air cooling device that is characterised in that it comprises at least one element for the deviation of at least a first portion of said air flow effected by the fan, to define an auxiliary air flow directed against the outer surface of the commutator.
  • the open-loop air cooling device according to the invention is indicated in its entirety with the number 1.
  • a conventional electric motor 2 comprising in particular a stator 3, fitted with stator coils 3a, and a rotor 4 splined onto a shaft 5 and fitted at a first end 5a thereof with a commutator 6.
  • the cooling device 1 comprises a fan 8 splined onto the shaft 5 itself and able to effect an air flow within an outer casing 9 that encompasses the stator 3 and the commutator 6.
  • On the casing 9 are obtained, in proximity to the commutator 6, intake slots or openings 10 and in proximity of the fan 8 slots or openings 11 for expelling the flow of air moved by the fan 8 itself.
  • the position of such slots which are located essentially in terminal areas of the casing 9, orients the air flow along the rotating and static organs of the motor 2 in such a way as to remove the heat that is developed therein due to the passage of electrical current and to friction.
  • the air cooling device 1 comprises, in proximity to the commutator 6, at least one element 12 for deviating at least a portion of the air flow effected by the fan 8, in such a way as to define an auxiliary air flow 13 directed against the outer surface of the commutator 6 itself.
  • two deviation elements 12 are provided, able to form a pair of auxiliary air flows 13 set in diametrically opposite positions with respect to the commutator 6.
  • the deviating elements 12 are located in the circumferential areas around the commutator 6, not occupied by the individual brushes 7, i.e. set therebetween.
  • Each deviating element 12 comprises at least one baffle 12a developing between one of the intake slots 10 and an area next to the outer surface of the commutator 6, preferably at a distance not exceeding 10 mm therefrom.
  • each deviating element 12 is to comprise a plurality of baffles 12a, able to define as a whole one or more air conveying channels 12b developing radially with respect to the commutator 6 and each positioned in continuation of one of the intake slots 10.
  • each conveying channel 12b of each deviating element 12 presents preferably in a plane transverse to the rotor 4 of the motor 2, a conformation essentially as an annulus sector converging towards the commutator 6.
  • the presence of the separation baffles 12a allows to identify, among the slots 10, first slots 10a, dedicated to the flow of auxiliary air 13, and second slots 10b dedicated to a second portion 14 of all the air flow produced by the fan 8, destined to invest the stator 3 and the rotor 4.
  • At least the second slots 10b are located in proximity to a circumferential area of the motor occupied by the stator coils 3a so that the second part 14 of the air flow drawn in through the slots 10b can invest the stator coils directly.
  • the second slots 10b are located exclusively in alignment with cooling channels 15 conventionally defined between the containment body 9 and the stator 3, by means of longitudinal recesses set on the outer surface thereof, in the areas corresponding to the median longitudinal axes of the respective stator coils 3a.
  • Each deviating element 12 can advantageously be integrated in an insert, for instance made of moulded plastic material, presenting a base portion 12c fitted both with the first intake slots 10a and with the second slots 10b.
  • the base portion 12c in practice defines an area of the outer casing 9, in that the entire element 12 can easily be inserted in an opening set therein, after its separate fabrication as a distinct insert.
  • the invention attains important advantages.
  • auxiliary air flows 13 allow to enhance the effectiveness of the cooling obtained by the circulation of air due to the fan 8 especially in correspondence with the commutator 6, which the applicant has found to be the most critical area, i.e. the one most subject to large temperature increases, particularly with reference to motors designed to operate at high speed, where the sliding and sparking of the contacts as they slide on the rotor are particularly evident.
  • the auxiliary air flow directed against the commutator of the electric motor allows the latter to absorb, maintaining perfect operativeness, larger electrical currents than those corresponding to the nominal power guaranteed for the motor itself by the cooling loops of the prior art.
  • the nominal power of the motor can be increased even by more than 15%.
  • every electric notor provided with a commutator already existing on the market can quickly and easily be upgraded with simple modifications to its cooling device by means of the deviating elements 12 to a motor able to output larger powers than those originally envisioned.
  • the use of the subject device allows to improve cooling efficiency also in those applications wherein, to limit size and to weaken the instrumental parts of the outer casing positioned behind the commutator, the air intake slots are necessarily obtained laterally on the outer casing of the motor, in a position essentially alongside the commutator

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Dc Machiner (AREA)
EP19980830081 1998-02-19 1998-02-19 Dispositif de refroidissement à air pour moteurs électriques comportant un collecteur Expired - Lifetime EP0939481B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1998600036 DE69800036T2 (de) 1998-02-19 1998-02-19 Luftkühlungsanordnung für mit einem Kollektor ausgerüstete elektrische Motoren
EP19980830081 EP0939481B1 (fr) 1998-02-19 1998-02-19 Dispositif de refroidissement à air pour moteurs électriques comportant un collecteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19980830081 EP0939481B1 (fr) 1998-02-19 1998-02-19 Dispositif de refroidissement à air pour moteurs électriques comportant un collecteur

Publications (2)

Publication Number Publication Date
EP0939481A1 true EP0939481A1 (fr) 1999-09-01
EP0939481B1 EP0939481B1 (fr) 1999-10-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980830081 Expired - Lifetime EP0939481B1 (fr) 1998-02-19 1998-02-19 Dispositif de refroidissement à air pour moteurs électriques comportant un collecteur

Country Status (2)

Country Link
EP (1) EP0939481B1 (fr)
DE (1) DE69800036T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2887510A1 (fr) * 2013-12-20 2015-06-24 Siemens Aktiengesellschaft Dispositif de contact électrique pour une machine électrique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006050154A1 (de) * 2006-10-21 2008-04-30 Vem Sachsenwerk Gmbh Kühlungsanordnung für Schleifringe bei rotierenden elektrischen Maschinen
CN107516973A (zh) * 2016-06-16 2017-12-26 中电电机股份有限公司 绕线电机冷却器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092556A (en) * 1974-08-24 1978-05-30 Mabuchi Motor Co., Ltd. Forced cooled electric motor
JPS57142154A (en) * 1981-02-24 1982-09-02 Fuji Electric Co Ltd Wound-rotor type rotary electric machine
EP0412645A1 (fr) * 1989-08-09 1991-02-13 General Motors Corporation Ventilateur de refroidissement à double face pour une machine dynamo-électrique
GB2275829A (en) * 1993-03-05 1994-09-07 Black & Decker Inc Cooling commutated electric motors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092556A (en) * 1974-08-24 1978-05-30 Mabuchi Motor Co., Ltd. Forced cooled electric motor
JPS57142154A (en) * 1981-02-24 1982-09-02 Fuji Electric Co Ltd Wound-rotor type rotary electric machine
EP0412645A1 (fr) * 1989-08-09 1991-02-13 General Motors Corporation Ventilateur de refroidissement à double face pour une machine dynamo-électrique
GB2275829A (en) * 1993-03-05 1994-09-07 Black & Decker Inc Cooling commutated electric motors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 243 (E - 145) 2 February 1982 (1982-02-02) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2887510A1 (fr) * 2013-12-20 2015-06-24 Siemens Aktiengesellschaft Dispositif de contact électrique pour une machine électrique

Also Published As

Publication number Publication date
DE69800036T2 (de) 2000-05-25
DE69800036D1 (de) 1999-12-02
EP0939481B1 (fr) 1999-10-27

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